by Tomasz Figa

[permalink] [raw]

Subject: Re: [PATCH v3 6/6] ARM: s5pv210: Migrate clock handling to Common Clock Framework

Hi Mateusz,

On Wednesday 28 of August 2013 18:13:04 Mateusz Krawczuk wrote:
> This patch migrates the s5pv210 platform to use new clock driver
> using Common Clock Framework.
>
> Signed-off-by: Mateusz Krawczuk <[email protected]>
> ---
> arch/arm/mach-s5pv210/Kconfig | 9 +++++++++
> arch/arm/mach-s5pv210/Makefile | 4 ++--
> arch/arm/mach-s5pv210/common.c | 17 +++++++++++++++++
> arch/arm/mach-s5pv210/common.h | 13 +++++++++++++
> arch/arm/mach-s5pv210/mach-aquila.c | 1 +
> arch/arm/mach-s5pv210/mach-goni.c | 3 ++-
> arch/arm/mach-s5pv210/mach-smdkc110.c | 1 +
> arch/arm/mach-s5pv210/mach-smdkv210.c | 1 +
> arch/arm/mach-s5pv210/mach-torbreck.c | 1 +
> arch/arm/plat-samsung/Kconfig | 2 +-
> arch/arm/plat-samsung/init.c | 2 --
> 11 files changed, 48 insertions(+), 6 deletions(-)
>
> diff --git a/arch/arm/mach-s5pv210/Kconfig
> b/arch/arm/mach-s5pv210/Kconfig index caaedaf..ad4546e 100644
> --- a/arch/arm/mach-s5pv210/Kconfig
> +++ b/arch/arm/mach-s5pv210/Kconfig
> @@ -15,6 +15,7 @@ config CPU_S5PV210
> select S5P_PM if PM
> select S5P_SLEEP if PM
> select SAMSUNG_DMADEV
> + select S5P_CLOCK if !COMMON_CLK
> help
> Enable S5PV210 CPU support
>
> @@ -69,6 +70,14 @@ config S5PV210_SETUP_USB_PHY
> help
> Common setup code for USB PHY controller
>
> +config COMMON_CLK_S5PV210
> + bool "Common Clock Framework support"
> + default y
> + select COMMON_CLK
> + help
> + Enable this option to use new clock driver
> + based on Common Clock Framework.
> +
> menu "S5PC110 Machines"
>
> config MACH_AQUILA
> diff --git a/arch/arm/mach-s5pv210/Makefile
> b/arch/arm/mach-s5pv210/Makefile index 1c4e419..0c67fe2 100644
> --- a/arch/arm/mach-s5pv210/Makefile
> +++ b/arch/arm/mach-s5pv210/Makefile
> @@ -12,8 +12,8 @@ obj- :=
>
> # Core
>
> -obj-y += common.o clock.o
> -
> +obj-y += common.o
> +obj-$(CONFIG_S5P_CLOCK) += clock.o
> obj-$(CONFIG_PM) += pm.o
>
> obj-y += dma.o
> diff --git a/arch/arm/mach-s5pv210/common.c
> b/arch/arm/mach-s5pv210/common.c index 26027a2..a1d86a1 100644
> --- a/arch/arm/mach-s5pv210/common.c
> +++ b/arch/arm/mach-s5pv210/common.c
> @@ -34,7 +34,13 @@
> #include <mach/regs-clock.h>
>
> #include <plat/cpu.h>
> +
> +#ifdef CONFIG_S5P_CLOCK
> #include <plat/clock.h>
> +#else
> +#include <linux/clk-provider.h>
> +#endif
> +
> #include <plat/devs.h>
> #include <plat/sdhci.h>
> #include <plat/adc-core.h>
> @@ -50,6 +56,14 @@
>
> #include "common.h"
>
> +/* External clock frequency */
> +static unsigned long xusbxti_f, xxti_f;

If the xxti_f variable is not being changed anywhere, it might be a good
idea to drop it completely and pass a constant zero to s5pv210_clk_init().

> +
> +void __init s5pv210_set_xusbxti_freq(unsigned long freq)
> +{
> + xusbxti_f = freq;
> +}
> +
> static const char name_s5pv210[] = "S5PV210/S5PC110";
>
> static struct cpu_table cpu_ids[] __initdata = {
> @@ -229,12 +243,14 @@ void __init s5pv210_map_io(void)
>
> void __init s5pv210_init_clocks(int xtal)
> {
> +#ifdef CONFIG_S5P_CLOCK
> printk(KERN_DEBUG "%s: initializing clocks\n", __func__);
>
> s3c24xx_register_baseclocks(xtal);
> s5p_register_clocks(xtal);
> s5pv210_register_clocks();
> s5pv210_setup_clocks();
> +#endif
> }
>
> void __init s5pv210_init_irq(void)
> @@ -248,6 +264,7 @@ void __init s5pv210_init_irq(void)
> vic[3] = ~0;
>
> s5p_init_irq(vic, ARRAY_SIZE(vic));
> + s5pv210_clk_init(NULL, xxti_f, xusbxti_f, S3C_VA_SYS);
> }
>
> struct bus_type s5pv210_subsys = {
> diff --git a/arch/arm/mach-s5pv210/common.h
> b/arch/arm/mach-s5pv210/common.h index fe1beb5..2db2a15 100644
> --- a/arch/arm/mach-s5pv210/common.h
> +++ b/arch/arm/mach-s5pv210/common.h
> @@ -14,6 +14,19 @@
>
> #include <linux/reboot.h>
>
> +void s5pv210_set_xxti_freq(unsigned long freq);

This function is no longer present in common.c, so should be removed here
as well.

> +void s5pv210_set_xusbxti_freq(unsigned long freq);
> +
> +#ifdef CONFIG_COMMON_CLK_S5PV210
> +void s5pv210_clk_init(struct device_node *np,
> + unsigned long xxti_f, unsigned long xusbxti_f,
> + void __iomem *reg_base);
> +#else
> +static inline void s5pv210_clk_init(struct device_node *np,
> + unsigned long xxti_f, unsigned long xusbxti_f,
> + void __iomem *reg_base) {}
> +#endif
> +
> void s5pv210_init_io(struct map_desc *mach_desc, int size);
> void s5pv210_init_irq(void);
>
> diff --git a/arch/arm/mach-s5pv210/mach-aquila.c
> b/arch/arm/mach-s5pv210/mach-aquila.c index ad40ab0..e37a311 100644
> --- a/arch/arm/mach-s5pv210/mach-aquila.c
> +++ b/arch/arm/mach-s5pv210/mach-aquila.c
> @@ -646,6 +646,7 @@ static void __init aquila_map_io(void)
> {
> s5pv210_init_io(NULL, 0);
> s3c24xx_init_clocks(24000000);
> + s5pv210_set_xusbxti_freq(24000000);
> s3c24xx_init_uarts(aquila_uartcfgs, ARRAY_SIZE(aquila_uartcfgs));
> samsung_set_timer_source(SAMSUNG_PWM3, SAMSUNG_PWM4);
> }
> diff --git a/arch/arm/mach-s5pv210/mach-goni.c
> b/arch/arm/mach-s5pv210/mach-goni.c index 282d714..a1955e9 100644
> --- a/arch/arm/mach-s5pv210/mach-goni.c
> +++ b/arch/arm/mach-s5pv210/mach-goni.c
> @@ -966,7 +966,8 @@ static void __init goni_sound_init(void)
> static void __init goni_map_io(void)
> {
> s5pv210_init_io(NULL, 0);
> - s3c24xx_init_clocks(clk_xusbxti.rate);
> + s3c24xx_init_clocks(24000000);
> + s5pv210_set_xusbxti_freq(24000000);
> s3c24xx_init_uarts(goni_uartcfgs, ARRAY_SIZE(goni_uartcfgs));
> samsung_set_timer_source(SAMSUNG_PWM3, SAMSUNG_PWM4);
> }
> diff --git a/arch/arm/mach-s5pv210/mach-smdkc110.c
> b/arch/arm/mach-s5pv210/mach-smdkc110.c index 7c0ed07..89563ed 100644
> --- a/arch/arm/mach-s5pv210/mach-smdkc110.c
> +++ b/arch/arm/mach-s5pv210/mach-smdkc110.c
> @@ -119,6 +119,7 @@ static void __init smdkc110_map_io(void)
> {
> s5pv210_init_io(NULL, 0);
> s3c24xx_init_clocks(24000000);
> + s5pv210_set_xusbxti_freq(24000000);
> s3c24xx_init_uarts(smdkv210_uartcfgs, ARRAY_SIZE(smdkv210_uartcfgs));
> samsung_set_timer_source(SAMSUNG_PWM3, SAMSUNG_PWM4);
> }
> diff --git a/arch/arm/mach-s5pv210/mach-smdkv210.c
> b/arch/arm/mach-s5pv210/mach-smdkv210.c index 6d72bb99..ff4a470 100644
> --- a/arch/arm/mach-s5pv210/mach-smdkv210.c
> +++ b/arch/arm/mach-s5pv210/mach-smdkv210.c
> @@ -285,6 +285,7 @@ static void __init smdkv210_map_io(void)
> {
> s5pv210_init_io(NULL, 0);
> s3c24xx_init_clocks(clk_xusbxti.rate);

This won't compile with common clk enabled, since it would reference a non-
existent clk_xusbxti symbol. Shouldn't this be changed in the same way as
mach-goni?

> + s5pv210_set_xusbxti_freq(24000000);
> s3c24xx_init_uarts(smdkv210_uartcfgs, ARRAY_SIZE(smdkv210_uartcfgs));
> samsung_set_timer_source(SAMSUNG_PWM2, SAMSUNG_PWM4);
> }
> diff --git a/arch/arm/mach-s5pv210/mach-torbreck.c
> b/arch/arm/mach-s5pv210/mach-torbreck.c index 579afe8..c131cd2 100644
> --- a/arch/arm/mach-s5pv210/mach-torbreck.c
> +++ b/arch/arm/mach-s5pv210/mach-torbreck.c
> @@ -105,6 +105,7 @@ static void __init torbreck_map_io(void)
> {
> s5pv210_init_io(NULL, 0);
> s3c24xx_init_clocks(24000000);
> + s5pv210_set_xusbxti_freq(24000000);
> s3c24xx_init_uarts(torbreck_uartcfgs, ARRAY_SIZE(torbreck_uartcfgs));
> samsung_set_timer_source(SAMSUNG_PWM3, SAMSUNG_PWM4);
> }
> diff --git a/arch/arm/plat-samsung/Kconfig
> b/arch/arm/plat-samsung/Kconfig index 7dfba93..2a98613 100644
> --- a/arch/arm/plat-samsung/Kconfig
> +++ b/arch/arm/plat-samsung/Kconfig
> @@ -91,7 +91,7 @@ config SAMSUNG_CLKSRC
> used by newer systems such as the S3C64XX.
>
> config S5P_CLOCK
> - def_bool (ARCH_S5P64X0 || ARCH_S5PC100 || ARCH_S5PV210)
> + def_bool (ARCH_S5P64X0 || ARCH_S5PC100)
> help
> Support common clock part for ARCH_S5P and ARCH_EXYNOS SoCs
>
> diff --git a/arch/arm/plat-samsung/init.c b/arch/arm/plat-samsung/init.c
> index aa9511b..f0f818e 100644
> --- a/arch/arm/plat-samsung/init.c
> +++ b/arch/arm/plat-samsung/init.c
> @@ -69,7 +69,6 @@ void __init s3c_init_cpu(unsigned long idcode,
> if (cpu->map_io)
> cpu->map_io();
> }
> -

This change doesn't belong to this patch.

> /* s3c24xx_init_clocks
> *
> * Initialise the clock subsystem and associated information from the
> @@ -92,7 +91,6 @@ void __init s3c24xx_init_clocks(int xtal)
> else
> (cpu->init_clocks)(xtal);
> }
> -

Ditto.

Otherwise looks good.

Best regards,
Tomasz